protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            listItems = new List<ListItem>  { 
              new ListItem {Title = "Important", Description="", IsGroupHeader=true}, 
              new ListItem {Title = "First", Description="1st item", IsGroupHeader=false}, 
              new ListItem {Title = "Less Important", Description="", IsGroupHeader=true}, 
              new ListItem {Title = "Second", Description="2nd item", IsGroupHeader=false},
              new ListItem {Title = "Third", Description="3rd item", IsGroupHeader=false},
              new ListItem {Title = "Fourth", Description="4th item", IsGroupHeader=false},
              new ListItem {Title = "Fifth", Description="5th item", IsGroupHeader=false},
              new ListItem {Title = "Not Important", Description="", IsGroupHeader=true}, 
              new ListItem {Title = "Sixth", Description="6th item" , IsGroupHeader=false},
              new ListItem {Title = "Seventh", Description="7th item", IsGroupHeader=false}, 
              new ListItem {Title = "Eighth", Description="8th item", IsGroupHeader=false},
              new ListItem {Title = "Ninth", Description="9th item", IsGroupHeader=false},
              new ListItem {Title = "Tenth", Description="10th item", IsGroupHeader=false}, 
              new ListItem {Title = "Trivial", Description="", IsGroupHeader=true}, 
              new ListItem {Title = "Eleventh", Description="11th item", IsGroupHeader=false},
              new ListItem {Title = "Twelfth", Description="12th item", IsGroupHeader=false},
              new ListItem {Title = "Thirteenth", Description="13th item", IsGroupHeader=false}, 
              new ListItem {Title = "Fourteenth", Description="14th item", IsGroupHeader=false},
              new ListItem {Title = "Fifteenth", Description="15th item" , IsGroupHeader=false},
              new ListItem {Title = "Sixteenth", Description="16th item", IsGroupHeader=false}, 
              new ListItem {Title = "Seventeenth", Description="17th item", IsGroupHeader=false},
              new ListItem {Title = "Eighteenth", Description="18th item", IsGroupHeader=false} 
            };

            ListAdapter = new ListGroupAdapter(this, listItems);
  
        }
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            listItems = new List <ListItem>  {
                new ListItem {
                    Title = "Important", Description = "", IsGroupHeader = true
                },
                new ListItem {
                    Title = "First", Description = "1st item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Less Important", Description = "", IsGroupHeader = true
                },
                new ListItem {
                    Title = "Second", Description = "2nd item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Third", Description = "3rd item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Fourth", Description = "4th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Fifth", Description = "5th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Not Important", Description = "", IsGroupHeader = true
                },
                new ListItem {
                    Title = "Sixth", Description = "6th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Seventh", Description = "7th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Eighth", Description = "8th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Ninth", Description = "9th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Tenth", Description = "10th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Trivial", Description = "", IsGroupHeader = true
                },
                new ListItem {
                    Title = "Eleventh", Description = "11th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Twelfth", Description = "12th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Thirteenth", Description = "13th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Fourteenth", Description = "14th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Fifteenth", Description = "15th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Sixteenth", Description = "16th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Seventeenth", Description = "17th item", IsGroupHeader = false
                },
                new ListItem {
                    Title = "Eighteenth", Description = "18th item", IsGroupHeader = false
                }
            };

            ListAdapter = new ListGroupAdapter(this, listItems);
        }